The Fourth of July is all about red, white and blue… so why does it end up costing so much green?  From patriotic clothing to yummy picnic treats to parking fees, there are hidden expenses around every corner.  BeFrugal.com has some great ideas. 1.    Take advantage of free summer outdoor activities to have fun. Some ideas include face paint, sidewalk chalk, hula hooping, running through the sprinkler, having a water balloon toss, and tossing the ball around at your nearby neighborhood park or school field. 2.    Attend a free event. Listen for activities held at parks and attractions near…